If’ usually introduces conditional clauses. The same applies to other conditionals such as unless, should and in case which, however, perform other functions in different contexts.

If I drink milk, I get stomach ache. We use the first conditional to talk about things which might happen if an action takes place. We use if for things which are likely to happen and when for ...

Would you please tell me in which circumstances we can use mixed conditionals? How many combinations can we have? Please give me some examples. With this combination we are contrasting an imagined ...